White dwarf
White dwarf is a compact stellar remnant formed after a low- or intermediate-mass star exhausts its nuclear fuel and expels its outer layers. It is characterized by high density and the absence of ongoing fusion reactions.
White dwarfs are discussed in astrophysics, stellar evolution, and observational astronomy.
Status
White dwarfs are observed through optical, ultraviolet, and X-ray measurements. Models of their structure, cooling rates, and role in binary systems continue to be developed.